PON (passive optical network) is a point-to-multipoint, fiber to the premises network architecture in which unpowered optical splitters are used to enable a single optical fiber to serve multiple premises, typically 16-128.A PON is a form of fiber-optic access network.Based on this PON system, C-Light supplies EPON(Ethernet PON), GPON(Gigabit-Capable PON) and 10GPON(10Gigabit-Capable PON) SFP+ XFP transceiver modules for ONU(Optic Network Unit) and OLT(Optical Line Terminal) application.